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<meta name="description" content="######1). 简介生命周期感知组件执行操作以响应另一个组件（例如活动和片段）的生命周期状态的更改。 这些组件可帮助您生成更易于组织且通常更轻量级的代码，这些代码更易于维护。一种常见的模式是在活动和片段的生命周期方法中实现依赖组件的操作。 但是，这种模式导致代码组织不良以及错误的增加。 通过使用生命周期感知组件，您可以将依赖组件的代码移出生命周期方法并移入组件本身。">
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<meta property="og:description" content="######1). 简介生命周期感知组件执行操作以响应另一个组件（例如活动和片段）的生命周期状态的更改。 这些组件可帮助您生成更易于组织且通常更轻量级的代码，这些代码更易于维护。一种常见的模式是在活动和片段的生命周期方法中实现依赖组件的操作。 但是，这种模式导致代码组织不良以及错误的增加。 通过使用生命周期感知组件，您可以将依赖组件的代码移出生命周期方法并移入组件本身。">
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<meta name="twitter:description" content="######1). 简介生命周期感知组件执行操作以响应另一个组件（例如活动和片段）的生命周期状态的更改。 这些组件可帮助您生成更易于组织且通常更轻量级的代码，这些代码更易于维护。一种常见的模式是在活动和片段的生命周期方法中实现依赖组件的操作。 但是，这种模式导致代码组织不良以及错误的增加。 通过使用生命周期感知组件，您可以将依赖组件的代码移出生命周期方法并移入组件本身。">
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          <h1 class="post-title" itemprop="name headline">Architecture----Lifecycle</h1>
        

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        <p>######1). 简介<br>生命周期感知组件执行操作以响应另一个组件（例如活动和片段）的生命周期状态的更改。 这些组件可帮助您生成更易于组织且通常更轻量级的代码，这些代码更易于维护。<br>一种常见的模式是在活动和片段的生命周期方法中实现依赖组件的操作。 但是，这种模式导致代码组织不良以及错误的增加。 通过使用生命周期感知组件，您可以将依赖组件的代码移出生命周期方法并移入组件本身。</p>
<a id="more"></a>
<p>######2). 依赖<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">// ViewModel and LiveData</span><br><span class="line">implementation &quot;android.arch.lifecycle:extensions:$lifecycle_version&quot;</span><br><span class="line">// alternatively - just ViewModel</span><br><span class="line">implementation &quot;android.arch.lifecycle:viewmodel:$lifecycle_version&quot; // use -ktx for Kotlin</span><br><span class="line">// alternatively - just LiveData</span><br><span class="line">implementation &quot;android.arch.lifecycle:livedata:$lifecycle_version&quot;</span><br><span class="line">// alternatively - Lifecycles only (no ViewModel or LiveData).</span><br><span class="line">//     Support library depends on this lightweight import</span><br><span class="line">implementation &quot;android.arch.lifecycle:runtime:$lifecycle_version&quot;</span><br><span class="line">annotationProcessor &quot;android.arch.lifecycle:compiler:$lifecycle_version&quot; // use kapt for Kotlin</span><br><span class="line">// alternately - if using Java8, use the following instead of compiler</span><br><span class="line">implementation &quot;android.arch.lifecycle:common-java8:$lifecycle_version&quot;</span><br><span class="line">// optional - ReactiveStreams support for LiveData</span><br><span class="line">implementation &quot;android.arch.lifecycle:reactivestreams:$lifecycle_version&quot;</span><br><span class="line">// optional - Test helpers for LiveData</span><br><span class="line">testImplementation &quot;android.arch.core:core-testing:$lifecycle_version&quot;</span><br></pre></td></tr></table></figure></p>
<p>######3). 解决问题</p>
<ul>
<li>主要解决MVP模式时Activity和Fragment声明周期问题<br>######4). 原MVP写法</li>
<li><p>Presenter接口</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">interface IPresenter &#123;</span><br><span class="line">  fun onCreate()</span><br><span class="line">  fun onStart()</span><br><span class="line">  fun onResume()</span><br><span class="line">  fun onPause()</span><br><span class="line">  fun onStop()</span><br><span class="line">  fun onDestroy()</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>Presenter实现</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">class CustomPresenter : IPresenter &#123;</span><br><span class="line">  companion object &#123;</span><br><span class="line">    private val TAG = CustomPresenter::class.java.simpleName</span><br><span class="line">  &#125;</span><br><span class="line">  override fun onCreate() &#123;</span><br><span class="line">    Log.e(TAG, &quot;-- onCreate&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">  override fun onStart() &#123;</span><br><span class="line">    Log.e(TAG, &quot;-- onStart&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">  override fun onResume() &#123;</span><br><span class="line">    Log.e(TAG, &quot;-- onResume&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">  override fun onPause() &#123;</span><br><span class="line">    Log.e(TAG,&quot;-- onPause&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">  override fun onStop() &#123;</span><br><span class="line">    Log.e(TAG, &quot;-- onStop&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">  override fun onDestroy() &#123;</span><br><span class="line">    Log.e(TAG, &quot;-- onDestroy&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>Activity代码</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br></pre></td><td class="code"><pre><span class="line">class CustomLifeCycleActivity : AppCompatActivity() &#123;</span><br><span class="line">  private lateinit var presenter: IPresenter</span><br><span class="line">  </span><br><span class="line">  companion object &#123;</span><br><span class="line">    private val TAG = CustomLifeCycleActivity::class.java.simpleName</span><br><span class="line">  &#125;</span><br><span class="line">  override fun onCreate(savedInstanceState: Bundle?) &#123;</span><br><span class="line">    super.onCreate(savedInstanceState)</span><br><span class="line">    setContentView(R.layout.activity_custom_life_cyclle)</span><br><span class="line">    presenter = CustomPresenter()</span><br><span class="line">    Log.e(TAG, &quot;-- onCreate&quot;)</span><br><span class="line">    presenter.onCreate()</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  override fun onStart() &#123;</span><br><span class="line">    super.onStart()</span><br><span class="line">    Log.e(TAG, &quot;-- onStart&quot;)</span><br><span class="line">    presenter.onStart()</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  override fun onResume() &#123;</span><br><span class="line">    super.onResume()</span><br><span class="line">    Log.e(TAG, &quot;-- onResume&quot;)</span><br><span class="line">    presenter.onResume()</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  override fun onPause() &#123;</span><br><span class="line">    super.onPause()</span><br><span class="line">    Log.e(TAG, &quot;-- onPause&quot;)</span><br><span class="line">    presenter.onPause()</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  override fun onStop() &#123;</span><br><span class="line">    super.onStop()</span><br><span class="line">    Log.e(TAG, &quot;-- onStop&quot;)</span><br><span class="line">    presenter.onStop()</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  override fun onDestroy() &#123;</span><br><span class="line">    super.onDestroy()</span><br><span class="line">    Log.e(TAG, &quot;-- onDestroy&quot;)</span><br><span class="line">    presenter.onDestroy()</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<p>打印结果：<br><img src="https://upload-images.jianshu.io/upload_images/3110861-1b13f6c505b808a2.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图1.png"></p>
<p>######5). Lifecycle写法</p>
<ul>
<li><p>Presenter接口</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">interface IPresenter : LifecycleObserver &#123;</span><br><span class="line">  @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)</span><br><span class="line">  fun onCreate(@NotNull owner: LifecycleOwner)</span><br><span class="line">  </span><br><span class="line">  @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)</span><br><span class="line">  fun onDestroy(@NotNull owner: LifecycleOwner)</span><br><span class="line">  </span><br><span class="line">  @OnLifecycleEvent(Lifecycle.Event.ON_ANY)</span><br><span class="line">  fun onLifecycleChanged(@NotNull owner: LifecycleOwner)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>Presenter实现</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">class SpecialPresenter : IPresenter &#123;</span><br><span class="line">  companion object &#123;</span><br><span class="line">    private val TAG = SpecialPresenter::class.java.simpleName</span><br><span class="line">  &#125;</span><br><span class="line">  override fun onCreate(owner: LifecycleOwner) &#123;</span><br><span class="line">    Log.e(TAG, &quot;onCreate&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  override fun onDestroy(owner: LifecycleOwner) &#123;</span><br><span class="line">    Log.e(TAG, &quot;onDestroy&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">  override fun onLifecycleChanged(owner: LifecycleOwner) &#123;</span><br><span class="line">    Log.e(TAG, &quot;onLifecycleChanged&quot;)</span><br><span class="line">  &#125;</span><br><span class="line">  </span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
<li><p>Activity代码</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">class SpecialLifeCycleActivity : AppCompatActivity() &#123;</span><br><span class="line">  </span><br><span class="line">  override fun onCreate(savedInstanceState: Bundle?) &#123;</span><br><span class="line">    super.onCreate(savedInstanceState)</span><br><span class="line">    setContentView(R.layout.activity_special_life_cycle)</span><br><span class="line">    val presenter = SpecialPresenter()</span><br><span class="line">    // 添加观察者</span><br><span class="line">    lifecycle.addObserver(presenter)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<p>打印结果:<br><img src="https://upload-images.jianshu.io/upload_images/3110861-d2ba0251bb72e4db.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图2.png"></p>
<p>######6). 组件原理<br><img src="https://upload-images.jianshu.io/upload_images/3110861-c1b525c68bd57011.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="原理图.png"></p>
<p>######7). 时序图<br><img src="https://upload-images.jianshu.io/upload_images/3110861-f1d5e5c9c7bf23c5.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="时序图.png"></p>
<p>######8). Event枚举<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">public enum Event &#123;</span><br><span class="line">    /**</span><br><span class="line">     * Constant for onCreate event of the &#123;@link LifecycleOwner&#125;.</span><br><span class="line">     */</span><br><span class="line">    ON_CREATE,</span><br><span class="line">    /**</span><br><span class="line">     * Constant for onStart event of the &#123;@link LifecycleOwner&#125;.</span><br><span class="line">     */</span><br><span class="line">    ON_START,</span><br><span class="line">    /**</span><br><span class="line">     * Constant for onResume event of the &#123;@link LifecycleOwner&#125;.</span><br><span class="line">     */</span><br><span class="line">    ON_RESUME,</span><br><span class="line">    /**</span><br><span class="line">     * Constant for onPause event of the &#123;@link LifecycleOwner&#125;.</span><br><span class="line">     */</span><br><span class="line">    ON_PAUSE,</span><br><span class="line">    /**</span><br><span class="line">     * Constant for onStop event of the &#123;@link LifecycleOwner&#125;.</span><br><span class="line">     */</span><br><span class="line">    ON_STOP,</span><br><span class="line">    /**</span><br><span class="line">     * Constant for onDestroy event of the &#123;@link LifecycleOwner&#125;.</span><br><span class="line">     */</span><br><span class="line">    ON_DESTROY,</span><br><span class="line">    /**</span><br><span class="line">     * An &#123;@link Event Event&#125; constant that can be used to match all events.</span><br><span class="line">     */</span><br><span class="line">    ON_ANY</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>######9). <a href="https://developer.android.google.cn/topic/libraries/architecture/lifecycle" target="_blank" rel="noopener">原文链接</a></p>
<p>######10). <a href="https://gitee.com/mazaiting/Android-Jetpack/tree/master/app/src/main/java/com/mazaiting/jetpack/architecture/lifecycle" target="_blank" rel="noopener">代码下载</a></p>

      
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